Membrane Precipitator For Cement Plant Kiln Inlet Flue Gas Desulfurization Mechanism Study

In this article, by analyzing the characteristics of the actual dust to research the flue gas desulphurization mechanism of inorganic membrane filter at the kiln tail of cement plant, it is on basis of the experimental of its remove dust. This work is a positive and beneficial research in the theory of membrane science and its application, the research work provide a valuable reference in the field of gas-solid separation and the flue gas desulphurization for its more widely application.The membrane is an inert inorganic, it doesn't take part in desulphurization reaction. In the research, by using chemical analysis methods and XRD pattern analysis methods to analyze the dust of inorganic membrane filter's inlet and outlet, and the gas by automatic flue gas analyzer. There is 2.0%～5.7% of desulphurization efficiency under these conditions that the gas flow rate is 22.4 L/min, the mass concentration of SO₂ is 1700 mg/m³, the mass concentration of dust is 31.54 g/m³,the gas temperature is 50℃and relative humidity is 0.7.In according these to study the gas desulphurization mechanism of inorganic membrane filter.The results show that the gas desulphurization mechanism of inorganic membrane filter is dust carried by gas is absorbed in inorganic membrane, including the potential alkaline substances in the steam activation and release Ca(OH)₂, alkaline material and SO₂ result in the chemical reaction, produce desulphurization efficiency. The desulphurization process is gas-solid reaction, the paper using gas-solid reaction shrinking core model, and also the regional grain of reaction. On this basis induce the fractal dimension to rectify shrinking core model because the dust particle shape is not a spherical lead to the error of desulphurization efficiency. By using the improved model to do a contrastive analysis of the concentration of SO₂, the relative humidity of gas, the temperature, sulfur and calcium's ratio to research the desulphurization efficiency. Through these important factors' analysis found: the mainly control desulphurization process is sulfur dioxide gas through the ash layer diffusion resistance in inorganic membrane filter. The inlet's the concentration of sulfur dioxide gas, and the gas temperature compared to the relative humidity and Ca/S's effect is small in desulphurization efficiency. Relative humidity is the most important factor to impact the inorganic membrane filter's desulphurization efficiency.